Non Flowering Rhododendron

I bought a Rhododendron in a pot (in flower) three years ago. After flowering I repotted it in Rhododendron/Azalea compost and it grew to twice its size seeming to be happy. The next year a squirrrel (bless him) ate the buds. The year after that buds grew again but never formed flowers. The plant is still in this odd state. How can I get it to flower again? Advice appreciated. Thanks.